Please note that Bangkok has two international airports, Don Mueang Airport and the newer Suvarnaphumi Airport. Since the start of 2012 all Thai airlines flying to Koh Samui or Surat Thani have operated from Suvarnaphumi Airport.
UPDATE... September, 2012... Air Asia and Nok air move back to Don Muang Airport and now operate all flights from this airport.
There are also daily direct international flights from Hong Kong, Kuala Lumphur and Singapore.
Another domestic option is to fly to Surat Thani Airport, on the Thai mainland with bus and boat transfer to Nathon, in Koh Samui. Flight carriers to Surat Thani airport are Nok Air, Air Asia and Thai Airways with flight prices often around 50% or more cheaper than flights direct to Koh Samui Airport.
Domestic Flights to Koh Samui Airport
Domestic flights to and from Koh Samui Airport are operated by both Bangkok Airways and Thai Airways. Destinations are Bangkok, Chiang Mai, Trat, Phuket, Sukhothai, Pattaya (U-Tapao) and Krabi.
Daily flights from Bangkok to Koh Samui operate between 6am and 10pm with flights every forty minutes or so. Be sure to take advantage of the Bangkok Airways lounge in Bangkok airport which offers complimentary snacks, refreshments and WiFi.
For further information on flight times to destinations other than Bangkok, please visit the Bangkok Airways and Thai Airways websites by clicking the provided links at the top of this page.
International Flights to Koh Samui Airport
Bangkok Airways operate direct international flights to Koh Samui from Singapore and Hong Kong with indirect flights via Bangkok to Bangladore, Dhaka, Luang Prabang, The Maldives, Mumbai, Phnom Pen, Siam Reap and Yangon.
The daily Bangkok Air flight to Singapore leaves Samui at 4.30pm with a flight time of two hours and the returning flight is at 8.10pm each day.
The daily flight to Hong Kong departs Samui International Airport at 11.35am with a flight duration of three hours twenty minutes with the returning flight leaving Hong Kong at 5.05pm.
For flight times to other international destinations, please visit the Bangkok Airways website by clicking provided link above.
Surat Thani Airport Domestic Flights
Air Asia, Nok Air and Thai Airways all operate daily services to Suvarnabhumi Airport, Bangkok from Surat Thani Airport with both Air Asia and Nok Air offering combined plane, bus and boat tickets enabling transfer to Koh Samui from Surat Thani.
Air Asia have two daily one-hour flights departing Surat Thani at 8.45am and 4.05pm with the return flights leaving Bangkok at 7am and 2.20pm.
Nok Air have three daily flights from Surat Thani to Bangkok at 9.10am, 1.10pm, and 9.15pm with returning flights departing Bangkok at 7.30am, 11.30am and 7.35pm.
Thai Airways operate two flights to Bangkok leaving Surat Thani at 11.55 am and 7.55pm with the return flights departing Bangkok at 10.00am and 5.50pm.
Thai Airways also operate domestic flights fom Surat Thani Airport to Chiang Mai, Chiang Rai, Hat Yai, Khoen Kaen, Krabi, Phuket, Ubon Ratchathani and Udon Thani. Please click provided links above to visit their websites for more information.
Surat Thani Airport International Flights
The only international flight operated from Surat Thai Airport is Air Asia's short daily flight to Kuala Lumphur which departs Samui at 12.20pm each day with the returning flight departing Kuala Lumphur each day at 11.20am to arrive in Koh Samui at 11.50am
Article source: Samui Flights